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As a single driver advocate I find this whole conversation "interesting". Decades ago the design goal of speaker manufacturers was 80 - 8,000 Hz. The speakers in my main rig are rated 27 - 20,000 Hz but due to having 8 inch cones with no whizzer/super tweeter they start "beaming" around 4,000 Hz. So in a way oldtimers and I've been living like you werd for years. And I'm 56, so have lost some high frequency hearing. OTOH I feel like you need an audio intervention (and we all need to meet your librarian ).
May I suggest using one super tweeter facing to the rear wall and connected out of phase. If one has single driver speakers this may change your mind about tweeters. Mount the tweeter on a stand in the center of your main speakers. If you have two subs then by all means use one for the mains and one about 4ft. minimum. Set the polarity to out of phase grab a cold drink and be amazed at the room fill. Have fun.charles
Hmmm... first when I read the title I thought you were talking about a single speaker setup. Your actual experiment is weird, and i think something is flawed in your own speakers to feel improvements with such messed up stereo image.FYI one should use 2 subs unless they are <50hz only.What is also true is that mid-fi speakers have a HF bump/raising response that causes the thin, tiring, "hifi" sound that is most common nowadays, and that you dont like. Moreover, the directivity of any tweeter suffers a lot above 8-10khz. We absolutely DONT need a stronger power response below this frequency. Instead I have liked properly (+way above 10k) crossed supertweeters with good source equipment.
I think this also comes from having manufacturers emphasize the scintillating tweeters, from preamps to speakers. This often creates an artifical image field and a flat wall of sound instead of letting air between instruments and "above" speakers. However in a fully active system, one can adjust tweeters -crossover frequency and volume- so they become a natural extension of the fundamentals, almost disappearing.
I agree but the active lean to more distortion. But yes a great avenue. I am coming at from a purist approach.